Hejnar Photo Arca type 2.00 Inch Plate with Ridge. Made in U.S.A 2.00 inch rail with ridge. 2.00 inches (50.8mm) long. 1.50 inches wide. Weight: 1.00 oz (28g) 3/8 inches thick plus 1/8 ridge Precision C.N.C. machined from 6061-T6 Aluminium. Stainless steel hardware. Black hard coat anodized surface.